7Th Grade Lab 5 Respiration In Yeast

Mr. Tripp 7th Grade Lab #5 Respiration in Yeast Lab Station # ______Lab Members: Seat A:______Seat B:______Seat C: ______Seat D: ______

Standard(s): S7L2. Students will describe the structure and function of cells, tissues, organs, and organ systems. S7CS2. Students will use standard safety practices for all classroom laboratory and field investigations.

Essential Question:

Why must cells absorb energy and nutrients?

Answer:

Problem: To observe how organisms use sugar to create energy Background Information: Respiration is the process by which cells take in oxygen and release carbon dioxide and energy. It is the step-by-step breakdown of high-energy glucose molecules to release energy. It takes place day and night in all living cells. All cells carry out the process of cellular respiration in order to meet their energy needs. Energy, produced from glucose by cellular respiration, is required for the survival of all living things. The organelle where cellular respiration takes place in the cell is the mitochondrion. The mitochondrion is the organelle that makes energy from food for the cell's activities. When living things respire they produce heat energy. The chemical equation for respiration is: Glucose (C6H12O6) + Oxygen (6 O2) Carbon dioxide (6CO2) + Water (6H2O) = Energy Materials: Dry yeast, Balloon, Warm water, Soda bottle, Sugar, Masking tape, Tape measure Procedure: Group A (seats A & C) 1. Put 1 vial of yeast and 2 pouches of sugar in the clear bottle. 2. Fill the bottle to the black line with warm water. 3. QUICKLY stretch the balloon over the opening of the bottle. 4. Shake the bottle to speed up the reaction. 5. Measure the circumference of the balloon every 2 minutes. 6. Shake as needed to mix the ingredients. 7. Share your results with group B. Group B (seats B & D) 1. Put 1 vial of yeast and 2 pouches of sugar in the clear bottle. 2. Fill the bottle to the black line with warm water. 3. Insert a thermometer in the bottle. 4. Measure the temperature every 2 minutes. 5. Share your results with group A. Data: circumference of Balloon / Temperature at 2 Minute Intervals

Time (minutes) circumference (cm) Temperature (°C)

Data Analysis: Make Line Graphs of your data, remember title & labels:

Describe the following relationships shown in the graph: Time & temperature ______Time & circumference ______Conclusions: 1. What is the gas that filled the balloon? Where did it come from? Explain your answer. 2. Explain why the temperature changed during the investigation.

Lab Report : Respiration of Yeast

Teacher Name: Mr. Tripp

Student Name: ______

CATEGORY 4 3 2 1 Participation Used time well in Used time pretty Did the lab but did Participation was lab and focused well. Stayed not appear very minimal OR attention on the focused on the interested. Focus student was hostile experiment. experiment most of was lost on several about participating. the time. occasions.

Data Professional Accurate Accurate Data are not shown looking and representation of representation of OR are inaccurate. accurate the data in tables the data in written representation of and/or graphs. form, but no graphs the data in tables Graphs and tables or tables are and/or graphs. are labeled and presented. Graphs and tables titled. are labeled and titled. Error Analysis Experimental Experimental Experimental There is no errors, their errors and their errors are discussion of possible effects, possible effects are mentioned. errors. and ways to reduce discussed. errors are discussed. Safety Lab is carried out Lab is generally Lab is carried out Safety procedures with full attention to carried out with with some attention were ignored relevant safety attention to to relevant safety and/or some procedures. The relevant safety procedures. The aspect of the set-up, experiment, procedures. The set-up, experiment, experiment posed and tear-down set-up, experiment, and tear-down a threat to the posed no safety and tear-down posed no safety safety of the threat to any posed no safety threat to any student or others. individual. threat to any individual, but individual, but one several safety safety procedure procedures need to needs to be be reviewed. reviewed. Scientific Concepts Report illustrates Report illustrates Report illustrates a Report illustrates an accurate and an accurate limited inaccurate thorough understanding of understanding of understanding of understanding of most scientific scientific concepts scientific concepts scientific concepts concepts underlying the lab. underlying the lab. underlying the lab. underlying the lab.

Date Created: Sep 19, 2012 03:42 pm (UTC)